What happens when a predator loves its prey?

Centuries-old Mara is dying a slow death when she meets Lee, a young man whose life has never belonged to him. Thrown together, they're forced to fight those who would destroy them and survive a slew of enemies they never expected, even as Mara falls into a downward spiral of delusion and obsession. Will she make a devil's deal to save both their souls? With pasts like theirs, can they ever have a future?